Lathe tool



Jan. 4, 1938. K, N, NICHOLS 2,104,238

LATHE TOOL Filed April 29, 1936 Patented Jan. 4, 1938 UNITED STATESPrlrlzlarl OFFICE The present invention relates generally to lathes `orthe like machine, but more particularly toa novel and improved lathetool rfor automatically controlling the cutting edge so that the samewill describe `a semi-circle or a lesser portion of the arc of a perfectcircle.v

The primary object of the present invention is to provide a novel andimproved lathe tool which is adapted, to be mounted `on a bed of a latheand be adjusted so the tool thereof may cut semi-circular arcs ofvarious radii from the material mounted in the lathe.

A further object of the invention is to provide a novel and improvedconstruction of lathe tool in which a manually controlled mechanism isoperatively connected to a cutting tool for automatically guiding thecutting edge of said tool to describe the arc of a perfect circle.

Another object of the invention is'to provide a novel and improved lathetool in which the tool is adapted to be adjusted so as to describe thearc of a perfect circle and provided with means for adjusting thevarious sizes of arcs through which the tool travels in its cuttingoperation. a j

These and other objects are accomplished by providing a construction andan arrangementv of the various parts in the manner hereinaftervdescribed and particularly pointed out in the appended claims. f i

Referring to the drawing:

Fig. 1 is a top plan view of my improved lathe tool showing the mannerin which it is operatively associated with a conventional lathe;

Fig. 2 is a side elevational View partly in cross section illustratingthe construction of the device shown in Fig. 1;

Fig. 3 is a cross sectional view taken on the line 3-#3 in Fig. 1; 'y

Fig. 4 is a cross sectional line 4-4 in Fig. 1; and n Fig. 5 is a topplan View showing the construction of the operating parts thereof.y v

In illustrating one form of my invention I have shown the same inconnection with a conventional formv of lathe, only a'fragmentaryportion of which is shown in Figs. l and 2 of the drawing. The lathe inthis instance comprises the conventional carriage IIJ, a live center IIand a. dead center I2. Located between the live and dead center of thelathe is a piece of material I3 being worked upon. My improved lathetool comprises a main framie` or casting I 4 which is secured to the bedIIJ by means of a machine screw I5 extending through a central bore inthe' main frame I4.

view taken y on the f The lower threaded portion of the screw l5 en-4gages a lock nutl I6 which in turn conforms in configuration to thelongitudinal recess I1 in the carriage I0 for securing the tool to thevlathe.

Located adjacent the outer end vof and on the top side of the main frameI4 is a circular recess I8. '5'

Locatedconcentrically with respect to the recess I8 in the main frame I4is a central bore I9'. Mounted in the recess I8 is a worm wheel 2|.

Formed integrally with the worm wheel 2I is'a g stud `2Il which in `turnis journaled in the borev I9. 1'0

Formedjintegrally with the main vframe I4i's` an angularly disposedbearing barrel 22in which yis journaled a shaft 23. To the outer end ofthe shaft 23 is secured a manually or hand operated y. wheel 24; Securedto the inner end. of the shaft 10 andmeshing with the worm wheel r2| isa worm 25. Longitudinally adjustable on the main frame member I4 by adove-tail groove and dove-tail arrangement as shown generallyr by thereference I Trans- 2'0' character 26 is La movable member 21. verselymovable on the inner end of the member 21 by a similar dove-tailedgroove and tongue arrangement as shown at 28 is a tool supporting member29. Located in the upper portion of the Y member 29 is a longitudinalgroove 30 in which is 25 adapted to be secured a conventional cuttingtool clamp 3| for securing therein a cutting tool 32 by a set screw 33.Located adjacent the outer end of the sliding member 21 is a transverseslot 34 having an undercut recess 35 therearound ad- 30 jacent the lowersurface thereof. Secured to the upper surface of the worm. wheel are twospaced apart guide bars 36 which are provided with longitudinal recesses31 adjacent the inner lower edges as clearly shown in Fig. 2 ofthedrawing. 35

Adjustably mounted between the guide bars 36 and conforming inconfiguration to the recess formed vbythese bars isa sliding rectangularnut 38. This sliding nut 38 is provided with a central threaded boreadapted to receive in threaded en- 40 gagement with a threaded portionv39 of a lock bolt, generally indicated by the reference charac-I ter40. l This lock bolt'40 has an enlarged barrel', as shown at 4I, so thatits lower shoulders engage a washer 42 for clamping the bolt 40 and nutto 45 the inner ilanges of each of the guide members 36.' In thisconnection it will be noted that the enlarged barrel portion 4I of thebolt 40. Located adjacent the upper portion of the bolt 40 is anoverhanging flange 46 which slidingly engages 50 the upper surface ofthe lever 44 adjacentV the slot 45. Located inwardly from andconcentrically with respect to the pivot of the lever 44 is an ar cuate$1017.41. This slot 41 permits `the entrance p f la -hexagonal wrenchthrough an aperture 48`in v55 the member 21 for engagement with ahexagonal recess 49 formed in the head of the screw I5. This arrangementpermits the operator to secure or remove the device from the carriage I0of the lathe. The forward end of the lever 44 is provided with arelatively short elongated slot 50 which is adapted to engage a pin 5Isecured to a forwardly projecting ear 52 formed integrally with thetransversely movable member 29.

The operation of my improved lathe tool is as follows:

Let us assume that the live center Il of the lathe is revolving thematerial I3 mounted in the lathe and that upon a manipulation of thehand wheel 24 in one direction the worm wheel 2| is revolved in adirection indicated by the arrow in Fig. 1 of the drawing. As theshoulder bolt 40 is revolved about the axis of the gear 2| on the stud20 from the full line position to the dotted line position shown in Fig.1, the enlargedv portion 4I of the bolt which extends through the slots34 and 45 of the member 21 and lever 4l!v respectively actuate the lever44 and lthe longitudinal reciprocal member 21 from full line position todotted line position shown in Figs. 1 and 2. At the same time, the lowerportion of the pin 5| will engage the outer end of the elongated slot 5Uin the lever 44 and cause the transversely movable slide member 29 tomove transversely with respect to the longitudinally movable slidemember 21 so that this member assumes the dotted line position shown inFig. 1 which results in causing the cutting edge of the tool to describethe arc oi a perfect circle or semi-circle upon a half revolution of theworm wheel 21. In this connection it will be noted that the diameter orradius of the arc of the circle being cut from the material may beenlarged or reduced from that shown in the drawing by merely looseningthe bolt 40 and ladjusting and clamping it in various positions betweenthe guide members 36 with respect to the axis of the center of the wormwheel 2`I so that various arcs of circles of different radii may bedescribed by the cutting edge of the tool for cutting the materialmounted between the live and dead centers of the lathe.

While in the above specification I have provided a simple, compact andefficiently operated lathe tool, it will of course be understood thatvarious modifications from the construction disclosed may be madewithout departing from the spirit and scope of the invention asexpressed in the following claims:

What I claim is my invention and desire to lsecure by Letters Patent is:

1. A lathe tool comprising a frame, a longitudinally movable membermounted on said frame, a transversely movable member mounted on said rstnamed member, a cutting tool carried by said last-named member, a leverpivoted to said rst named member, one end of said lever beingoperatively -connected to said second named member, a revolvable gearmounted on said frame, means connecting the other end of said lever tosaid gear, and manually operable means connected to said gear fortransmitting an `arcuate movement of a perfect circle to said tool.

2. Alathe tool Vcomprising a frame, a longitudinally movable membermounted on said frame, a transversely movable member mounted on saidfirst named member, a cutting tool carried by said last named member,means including a lever mounted on said frame and 4operatively connectedto both o`f said members for transmitting an arcuate movement to vsaidtool, and means for varying the size of the arcuate movement describedby said tool.

3. A lathe tool comprising a frame, a longitudinally movable membermounted on said frame, a transversely movable member mounted on said rstnamed member, a cutting tool carried by said last named member, meansincluding a pivoted lever mounted on said frame and operativelyconneoted to both of said members for transmitting an arcuate movementto said tool, and means for adjusting said last named means for varyingthe size of the arcuate movement described by said tool.

4. A lathe tool comprising a frame, a member slidable longitudinally onsaid frame, a tool supporting member slidable transversely with respectto and mounted on said iirst named member, a cutting tool adjustablysecured to said last named member, a lever pivoted intermediate its endsto said first named member, said tool supporting member being pivoted bya longitudinal slot adjacent the inner end of said lever, a gearjournaled in said frame, transversely arranged guide bars carried bysaid gear forming a diametral slot therebetween, an adjustable studsecured in said slot, there being a longitudinal slot formed adjacentthe outer end of said lever embracing said stud, and a manually operableworm meshing with said gear for transmitting an arcuate movement of aperfect circle to said tool.

5. A lathe tool comprising a frame, a member slidable longitudinally onsaid frame, a tool supporting member slidable transversely with respectto and mounted on said iirst named member, a cutting tool adjustablysecured to said last named member, a lever pivoted intermediate its endsto said iirst named member, said tool supporting member being pivoted bya. longitudinal slot adjacent the inner end of said lever, a gearjournaled in said frame,rtransversely arranged guide bars carried bysaid gear forming a diametral slot therebetween, an adjustable studsecured in said slot, there being a longitudinal slot formed adjacentthe outer end of said lever embracing said stud, a manually Yoperableworm meshing with said gear for transmitting an arcuate movement of aperfect circle to said tool, and means whereby said stud may be adjustedwith respect to the axis of said gear for varying the size of the arcdescribed by said tool.

6. .A lathe tool comprising a frame, a member slidable longitudinally onsaid frame, a tool supporting member slidable transversely with respectto and `mounted on said first named member, a cutting tool adjustablysecured to said last named member, a lever pivoted intermediate its endsto said rst named member, said tool supporting member being pivoted by alongitudinal slot adjacent the inner end of said lever, a gear journaledin said frame, transversely arranged guide bars Vcarried by said gearforming a diametral slot therebetween, an adjustable stud secured in.said slot, there being a longitudinal slot formed adjacent the outerend of said lever embracing said stud, a worm mounted in said framemeshing with .said gear, and a hand wheel connected to said worm foroperatively moving said tool.

7. A lathe tool comprising a frame, a member slidable longitudinally onsaid frame, a tool supporting member slidable transversely with respectto and mounted on said iirst named member, a cutting tool adjustablysecured to said last named member, a lever pivoted intermediate its endsto said rst named member, said tool supporting member being pivoted by alongitudinal slot adjacent the inner end of said lever, a gear journaledin said frame, transversely arranged guide bars carried by said gearforming a diametral slot therebetween, an adjustable stud secured insaid slot, there being a longitudinal slot formed adjacent the outer endof said lever embracing said stud, there being a transverse slotadjacent the forward end of said rst named member embracing said stud,and a manually operable worm meshing with said gear for transmitting anarcuate movement of a perfect circle to said tool.

KENNETH N. NICHOLS.

